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MD ARIFUL HAQUE
MD ARIFUL HAQUE

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78. Subsets

78. Subsets

Medium

Given an integer array nums of unique elements, return all possible subsets1 (the power set).

The solution set must not contain duplicate subsets. Return the solution in any order.

Example 1:

  • Input: nums = [1,2,3]
  • Output: [[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3]]

Example 2:

  • Input: nums = [0]
  • Output: [[],[0]]

Constraints:

  • 1 <= nums.length <= 10
  • -10 <= nums[i] <= 10
  • All the numbers of nums are unique.

Solution:

class Solution {

    /**
     * @param Integer[] $nums
     * @return Integer[][]
     */
    function subsets($nums) {
        $ans = [[]];    
        foreach($nums as $num){
            $ans_size = count($ans);            
            for($i = 0; $i < $ans_size; $i++){
                $cur = $ans[$i];
                $cur[] = $num;
                $ans[] = $cur;
            }
        }        
        return $ans;
    }
}
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  1. Subset A subset of an array is a selection of elements (possibly none) of the array. 

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